Elongation gauge



Dec. 9, 1941. G. E. NAGEL 2,265,539V

ELONGATION GAUGE Filed Aug. 24, 1938 5 Sheets-Sheet 2 (Ittornegs.

Dec. 9, 1941. G. E. NAGEL ELONGATION GAUGE Filed Aug. 24, 1938 3 Sheets-Sheet I5 We@ Y u :inventor G50/@6E E. M651..

attorneys,

Patented Dec. 9, 1941 ELONGATION GAUGE George E. Nagel, Middletown, Ohio, assignor to The American Rolling Mill Company, Middletown, Ohio, a. corporation of Ohio Application August 24, 1938, Serial No. 226,517

(Cl. SII-31.1)

8 Claims.

This invention relates to a method and apparatus for measuring and indicating the elongation o f material undergoing av reduction process, and is useful, for example, in gauging the elongation in the rolling of strip metal. Although it is not so limited, my invention isparticularly advantageous in connection with the procedure known as temper: rolling where elongations ranging from 0.2 per cent or 0.002 up to 3 per cent, or 0.03 are encountered.

Although this invention may be used with various types of indicating devices, it is particularly advantageous, and I have shown it, in connection with an elongation gauge, operating upon the stroboscopic principle, such for example as are disclosed in co-pending applications, Serial No. 170,899, filed October 25, 1937, in the name of Ernest G. Schlup, and Serial No. 195,839, filed March 14, 1938, in the name of Edwin B. Hudson.

In the devices of the co-pending applications referred toit was necessary to change the discs each time a different elongation was to be gauged, and a primary object of my invention, therefore, consists in the provision of a mechanism whereby a single disc is used and which is settable through a range of infinite adjustments in order to gauge any desired elongation.

Another object of my invention includes the provision of a device as above outlined which will be simple and extremely accurate and inexpensive to construct.

These and other objects of my invention which will be pointed out hereinafter or which will be apparent to one skilled in the art upon reading these specifications, I accomplish by that certain,

construction and arrangement of parts of which I shall now describe an exemplary embodiment.

Reference is now made to the drawings forming a part hereof and in which- Figure 1 is a cross sectional view through a mill, embodying a device according to my invention with the strip passing from left to right.

Figure 2 is a detail elevational view of the adjustable drive as seen from the left of Figure 1.

Figure 3 is a detail elevational view of the indicating device on the delivery side of the mill, as seen from the right of Figure 1.

Figure 4 is a wiring diagram for the device.

Briefly in the practice of my invention I provide rolls 2 and 6 respectively on the entering and exit sides of the mill over which the strip passes, and which are adapted to be driven by contact with the strip at strip speed. Referring to Figure 1, the strip is indicated at I, the working rolls at 3. the backing rolls at I, and the mill housing at 5. The rolls 2 and 6 may be mounted in any desired or well known manner.

I provide means, preferably on the entering side of the mill driven from the roll 2, for actuating a circuit breaker cam which is connected in a circuit with a neon light, said neon light being placed in operative relationship with a stroboscopic disc arranged to be driven by the roll 6 on the exit side of the mill. From the foregoing it will be clear that if the speed of the circuit breaker cam and the speed of the stroboscopic disc are properly correlated the indicia on the stroboscopic disc will appear to stand still when the correct elongation is being produced. Since the strip on the exit side of the mill is elongated it has a higher linear speed; for example, it an elongation of one-half of 1% is being produced 100,500 linear feet of strip will pass over the roll 6 when 100,000 of linear feet of strip pass over the roll 2 and the correct relationship between the circuit breaker cam and the stroboscopic disc is attained when the former is rotated at the same speed or a multiple of the speed of the stroboscopic disc.

In the above mentioned co-pending applications, the provision of a series of discs of certainv diameters for certain per cents of elongation is disclosed. In the present invention I provide means whereby the speed of the circuit breaker cam may be varied without changing discs.

Referring now to Figure 2, I have shown a speed change cone 9 mounted on a shaft 8 which is arranged to be driven by the roll 2 through the gear and pinion, I0 and II respectively. A

disc I2 is mounted to ride upon ,or be frictionally driven by the cone 9, and provision is made for adjusting the position of the disc I2 axially of the cone 9. The disc I2 is carried upon a shaft Illa, which shaft also carries the circuit breaker cam I8 which is located inside of the housing I9. The shaft Isa has bearings within the housing I 9 and also in the member I2a. The member I2a, the member I9, together with the disc I2 are mounted upon a base I2b, and a rack I1 is connected to the base |217 by means of the arms Ila which is positioned to mesh with the pinion I6. A screw I3, provided with a handle I4, is engaged in a nut I3a mounted on the mill housing 5 and is connected to the base I2b by an arm |317. The pinion I6 actuates a pointer I5a cooperating with a dial I5 in any desired manner. It will be understood that the base I2b is mounted for sliding movement on the mill housing parallel to the surface of the cone 9, while the rack I1 may be mounted in a horizontal position. For this reason the pinion I6 is wider than the rack II to permit the relative lateral movement of the rack with respect to the pinion. Suitable locking means may be provided for the screw I3.

The circuit breaker cam I8 interrupts the circuit through the contactors 20 and 2| so that, in the arrangement of Figure 4, the neon tube 22 is illuminated 16 times per revolution of the octagonal cam I 8, and therefore per revolution of the wheel I2. Electrical venergy may be supplied by a battery 23.

n the delivery side of the mill a stroboscopic disc 24 is mounted on a. shaft 28 so as to be driven from the roll 6 through the gear and pinion 26 and 21 respectively. The face of the stroboscopic disc 24 is provided with suitable divisions painted on that portion of the disc passing over the neon light 22. These divisions are equally spaced and accurately laid out as to spacing.

To calibrate the device it is only necessary to rotate the rolls 2 and 8 by means of the strip. with the rolls 3 open, and adjust the screw I3 until the stroboscopic disc 24 appears stationary. This situation is the correct one for zero elongation, and the indicating dial I is then set to zero. To secure any desired elongation, it is then only necessary to adjust the position of the disc I2 along the cone 9 until the proper ratio for that elongation has been established ,between the wheel I2 and the roll 2. This will be indicated on the dial I5. The rolling process is then commenced, and as long as the stroboscopic disc 24 appears to stand still the correct elongation is being produced. If the divisions on the stroboscopic disc appear to move in a clockwise or counterclockwise direction, the roller will know that too great or too small an elongation is being produced, as the case may be, and he may then adjust the mill screws until the stroboscopic disc again appears stationary.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In an elongation gauge having means driven by the strip on the entering and exit sides of a mill, means for causing one of said first mentioned means to rotate at the same speed as the other when a predetermined amount of elongation is being produced, said means including a speed change cone and a friction disc in operative relation therewith, said friction disc constituting part of an assembly which is mounted for movement parallel to the surface of revolution of said cone, means for adjusting the position of said assembly with respect to said cone and means actuated by movement of said assembly to indicate the elongation produced for the particular setting of said assembly, said last mentioned means including a rack fixed to said assembly, a pinion mounted in operative relationship to said rack and a dial fixedly mounted with relation to said pinion.

2. In an elongation gauge for rolling mills, comprising members adapted to be rotated by the strip on the entering and exit sides of the mill respectively, and having an element actuated by one of said members and disposed in stroboscopic relation with the other of said members, whereby the relation of speeds of said members may be visually checked, and means for definitely relating the rotative speeds of said members when the elongation is as predetermined, said means including a speed change cone whereby said gauge -number of elongations.

3. In an elongation gauge for rolling mills, comprising members adapted to be rotated by the strip on the entering and exit sides of the mill respectively, and having an element actuated by one of said members and disposed in stroboscopic relation with the other of said members, whereby the relation of speeds of said members may be visually checked, and means for definitely relating the rotative speeds of said members when the elongation is as predetermined, said means including a speed change device and means to indicate the setting of said speed change device whereby to indicate at what elongation said members will be driven at deiinitely related speeds.

4. In an elongation gauge for rolling mills, comprising members adapted to be rotated by the strip on the entering and exit sides of the mill respectively, and having an element actuated by one of said members and disposed in stroboscopic relation with the other of said members, whereby the relation of speeds oi said members may be visually checked, and means for definitely relating the rotative speeds of said members when the elongation is as predetermined, said means including a speed change cone and a friction disc in operative relation therewith, and means for adjusting the position of said disc along the surface of revolution of said speed change cone.

5. Inv an elongation gauge for rolling mills, comprising members adapted to be rotated by the strip on the entering and exit sides of the mill respectively, and having an element actuated by one of said members and disposed in stroboscopic relation with the other of said members, whereby the relation of speeds of said members may be visually checked, and means for definitely relating the rotative speeds of said members when the elongation is as predetermined, said means including a speed change cone and a friction disc in operative relation therewith, said friction disc constituting part oi' an assembly which is mounted for movement parallel to the surface of revolution of said cone, and means for adjusting the setting of said assembly.

6. In an elongation gauge forl rolling mills, comprising members adapted to be rotated by the strip on the entering and exit sides of the mill respectively, and having an element actuated by one of said members and disposed in strobosc-opic relation with the other of said members, whereby the relation of speeds of said members may be visually checked, and means for definitely relat- Q ing the rotative speeds of said members when the elongation is as predetermined, said means including a speed change cone and a friction disc in operative relation therewith, said friction disc constituting part of an assembly which is mounted for movement parallel to the surface of revolution of said cone, means for adjusting the position of said assembly with respect to said cone and means actuated by movement of said assembly to indicate the relonglanficin produced for the particular setting of said assembly.

7. In a draft control system for a strip rolling mill, in combination, two strobcscopic members comprising a rotatable member and a circuit make-and-break device, means connecting the rstrip on one side of the mill in driving relation with one of said stroboscopic members, means including a selectively adjustable variable speedratio transmission device connecting the strip on the other side of the mill in driving relation with the other of said stroboscopic members, a light producing device disposed to illuminate said rotatable member, and means connecting said circuit make-and-break device to control the energiaation of said light producing device.

8. In a draft control system for a strip rolling mill, in combination, two stroboscopic members comprising a rotatable member, and a circuit make-and-break device. means connecting the strip on one side of the mill in driving relation with one oi said stroboscopic members, means including a selectively adjustable variable speedratio transmission device connecting the strip on the other side of the mill in driving relation with the other of said stroboscopic members. a light producing device disposed to illuminate said rotatable member, and means connecting said circuit make-and-break device to control the energization of said light producing device, said variable speed-ratio transmission device comprising speed-ratio adjusting means and means for indicating the speed-ratio adjustment, whereby the speed-ratio adjustment indicating means provides a measure of the reduction of the strip in the mill.

GEORGE E. NAGEL. 

